Let's Talk Exhaust
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Lead Driver
Joined: Mar 2008
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From: Near Los Angeles
Let's Talk Exhaust
I'm coming off dual 2.5" header collectors, into a Y with a 3" out, and using 3" tube to the rear axle, out a Flowmaster 50, with a 2.5" tail pipe. I'm thinking that the gas will have cooled by the time it reaches the axle, so the smaller pipe diameter won't be a bottle neck or reduce performance.
Space is an issue and I wanted to do away with the dual pipes. The engine being a 300, both pipes are on passenger side. For clarification, I should mention that I'm changing from long tube Hedman (fitment issues, rattling) with 1.5" tubes, to a set of Clifford shorty headers with 1.625" (1 5/8")tubes. Collectors are 2.5" on both headers.
I didn't want to go with a single 2.5" tube since the hp limit is about 230, and I should be over 250. Does that sound kosher to all the exhaust experts?
Space is an issue and I wanted to do away with the dual pipes. The engine being a 300, both pipes are on passenger side. For clarification, I should mention that I'm changing from long tube Hedman (fitment issues, rattling) with 1.5" tubes, to a set of Clifford shorty headers with 1.625" (1 5/8")tubes. Collectors are 2.5" on both headers.
I didn't want to go with a single 2.5" tube since the hp limit is about 230, and I should be over 250. Does that sound kosher to all the exhaust experts?
Fleet Owner
Joined: Dec 2009
Posts: 20,678
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From: NorCal
2.5 inch into a single 3-inch inch all the way out is acceptable. Choking it down with a 2.5 inch tail section is usually not recommended but since ya got a 300p0, the HP/TQ level is low enough not to be negatively affected.
Proceed.
Proceed.
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Lead Driver
Joined: Mar 2008
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From: Near Los Angeles
And since it is horse power we are concerned with, regardless of the engine it comes out of, let us approach the topic anew.
With an engine putting out about 250 hp be bothered by reducing the exhaust tube from 3" to 2.5" when the gas is more than eight feet from the engine? Has the gas cooled by then and become denser? thereby not needing the same pipe area/volume? According to the info I have gathered, max hp for 2.5 tube is 230.
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